Space weather and infrastructure fragility. A severe solar storm can take down grids and satellites; low probability, unhedged, and increasingly relevant as autonomy and positioning spread.
What to watch: NOAA geomagnetic storm alerts. It arrives event, and the effect typically lasts days.
It sits in tier 4 — Stock and sector specific: Moves one company or one group, not the market. Any factor here becomes tier one if it gets large enough — a bank failure and a pandemic both started as somebody's sector news.
Its neighbourhood
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